Gage-cock



(No Model.)

G. JOHNSON.

GAGE COCK. v No. 595,123. Patented Dec. 7, 139-7.

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E V L IN VENTOH Uivrrn STATES PATENT rricn.

GEORGE JOHNSON, OF ALLENPORT, PENNSYLVANIA.

G AG E C O C K SPECIFICATION forming part of Letters Patent No. 595,123, dated December '7, 1897.

Application filed June 16,1897. Serial No. 641,007. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE JOHNSON, of Allenport, in the county of lVashington and State of Pennsylvania, have invented a new and Improved Gage-Cock, of which the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved gage-cock which is simple and durable in construction, easily manipulated, and not liable to get out of order.

The invention consists principally of a casing adapted to be secured to a boiler and formed at its inner end with a valve-seat, a valve adapted to be seated on the said seat by pressure from the boiler, the stem of the valve extending through the casing and a stufiing-box on the outer end thereof, and a cam on the said stem andjadapted to engage a cam surface on a cam attached to the casing.

The invention also consists of certain parts and details and combinations of the same, as will be fully described hereinafter and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference inclicate corresponding parts in both the figures.

Figure 1 is a sectional side elevation of the improvement, and Fig. 2 is an end View of the same with a modified form of handle.

The improved gage-cock is provided with a casing A, screwed or otherwise secured in the plate of a boiler B, as is plainly indicated in Fig. 1. The casing A is formed with a longitudinally-extending bore A, terminating at the inner end of the casing in avalveseat A on which is adapted to be seated, by

pressure from within the boiler, a valve 0, 40

formed or secured on the inner end of a valve stem 0', extending loosely through the bore A and through a stuffing-box D, held on the outer end of the casing. The bore A within the casing opens into a chamber A from the bottom of which leads an outlet A for the escape of steam and water from the boiler whenever the valve O is opened.

On the extreme outer end of the valve-stem O is secured a handle, either in the form of a wheel E, as shown in Fig. 1, or in the shape of a weighted arm E, as indicated in Fig. 2, the said wheel or arm being connected with a cord or rope adapted to be taken hold of by the operator to impart a turning motion to the said valve-stem 0 whenever it is desired to open the gage-cock.

On the gage-cock, between the handle E or E and the stufling-box D, is secured a cam F, adapted to engage a cam-surface C, formed on a bracket G, screwed or otherwise secured to the casing A. Normally the cam F is out of engagement with the cam-surface G, and when it is desired to open the valve C it is necessary for the operator to turn the valvestem 0 by manipulating the handle E or E accordingly, so that the cam finally moves in contact with the surface G to push the valve-stem O and the valve C inwardly and move the valve 0 off its seat A Thus the valve 0 is first turned in its seat and then moved laterally off its seat upon the stem 0, sliding in the stuffing-box D, by the action of the cam F on the cam-surface G. lVhen the operator releases the handle E or E, then the pressure on the valve C will force the valve outward back into its seat, the said valve turning in its seat during the time the cam F moves back to its former position.

It will be seen that by the arrangement described leakage is completely avoided, as the valve is firmly held to its seat by pressure from within the boiler and is always ground in its seat upon opening and closing the valve.

It will further be seen that the device is not liable to get out of order, as no springs or like breakable parts are used in the construction of the device.

Having thus fully described my invention,

I claim as new and desire to secure by Letters Patent-- 1. A gage-cock, comprising a casing adapted to be secured to a boiler, and formed at its inner end with a valve-seat, a valve adapted to be seated on the said seat by pressure from within the boiler, the stem of the valve extending through a stuffing-box in the casing, a cam on the said stem, and a bracket carried by the said casing, and havinga cam-surface adapted to be engaged by the said cam, to impart a sliding motion to the said valve stem, substantially as shown and described.

2. A gage-cock, comprising a casing adapted to be screwed to a boiler, and formed with a bore terminating at its inner end in a chamher having an outlet, a valve-seat on the inner end of the said casing, a valve adapted to be seated on the said seat, a Valve-stern carrying the said valve, and extending loosely through the said bore and the said chamber, and through a stuffing-box on the outer end of the said casin g, ahandle on the said stem, a cam secured on the said stem, and a bracket screwed on the said casing, and formed with 10 a cam-surface adapted to be engaged by the said cam, to slide the said valve-stem in the said casing, substantially as shown and described.

GEORGE JOHNSON. Witnesses:

JOHN MATTHEWS, J. W. ODY. 

